benefecation ore crusher vs screener vs trommel

guide of mineral processing methods: 3 main beneficiation - jxsc machine

Physical beneficiation includes magnetic separation, gravity separation, electrostatic beneficiation, friction beneficiation, particle size beneficiation, shape beneficiation, corona beneficiation and manual beneficiation.

Chemical mineral processing includes flotation method (physical and chemical mineral processing is the actual flotation), calcination method, leaching method (bacterial leaching and reagent leaching), mixed mercury method and cyanidation method.

Flotation is a mineral processing method which uses the different physical and chemical properties of mineral surface to separate minerals. Foam flotation is widely used in industry. It is characterized by selectively attaching minerals to the air bubbles in the pulp and then floating up to the surface of the ore slurry to achieve the separation of useful minerals from gangue.

Before flotation, the ore should be grinded to the size required by flotation, so that the useful minerals can basically achieve monomer dissociation for separation. And adding flotation reagent. During flotation, air is introduced into the pulp to form a large number of bubbles. Therefore, particles that are not easily wetted by water(commonly known as hydrophobic minerals), theyare attached to the bubblesandforming a mineralized foam layer along the bubble to the surface of the slurry. The particles that are easily wetted by water(commonly known as hydrophilic minerals), theycannot adhere to the bubbles and remain in the pulp. The purpose of separation is to discharge the mineralized foam.

Direct Flotation & ReverseFlotation In general, the useful minerals are floated into the foam products, leaving gangue minerals in the pulp. This flotation is usually called positive flotation. But sometimes gangue minerals float into foam products, leaving useful minerals in the pulp, which is called reverse flotation.

Preferential Flotation & Mixed Flotation If the ore contains two or more kinds of useful minerals, there are two flotation methods. One is called preferential flotation, the useful minerals are selected into a single concentrate one by one; The other is called mixed flotation, the useful minerals are selected as mixed concentrate at the same time, and then the useful minerals in the mixed concentrate are separated one by one.

Advantages and Disadvantages Flotation method has high separation efficiency. It can effectively separate low-grade ore into high-grade concentrate, especially for the ore with fine-grained distribution and complex composition. When the flotation method is used, it can often achieve good separation effect. But the flotation method must use flotation reagent, so its mineral processing cost is generally higher than gravity separation method and magnetic separation method.

Minerals are divided into strong magnetic minerals, weak magnetic minerals and non-magnetic minerals. Magnetic separation is a mineral separation method in heterogeneous magnetic field according to the difference of mineral magnetism in ore. Magnetic separation is mainly used for magnetic oxide minerals of ferrous minerals, such as magnetite, V-Ti magnetite, hematite and ilmenite, and also for pyrrhotite beneficiation.

Magnetic separation is the concentrationof ilmenite. It uses different permeability of various minerals to make them pass through a magnetic field. Because different minerals react to magnetic field differently, minerals with high permeability are sucked up by disk, and then they fall off. After collecting them through aggregate funnel, the low permeability will not be absorbed, and the belt left in the material or rotating can be separated as tailings.

Gravity separation, also known as gravity dressing. It refers to the mineral processing method that makes use of the difference of relative density, particle size and shape of the separated mineral particles and the difference of movement speed and direction in the medium (water, air or other liquid with relatively high density) to separate them.

Application Compared with other mineral processing methods, gravity separation has the advantages of large processing capacity, wide range of particle size, simple equipment structure, no consumption of valuable production materials, low operation cost and no pollution, so it is widely used in the beneficiation of tungsten and tin ores. It is also widely used in the separation of ferrous metals (iron, manganese, chromium), rare metals (tantalum, niobium, thorium, zirconium, titanium, etc.) and precious metal ores.

Gravity separation is also the main method of coal processing. Gravity separation is also used to separate non-metallic minerals such as pyrite, apatite, diamond and asbestos from coal measures. For those nonferrous metal ores (copper, lead, zinc, etc.) which are mainly treated by flotation, heavy medium mineral processing can also be used to remove coarse gangue or surrounding rock in advance to achieve preliminary enrichment. Classification and dehydration of gravity separation are indispensable in almost all concentrators.

jaw crusher vs impact crusher (a comparison from 7 points) - jxsc

Rock crushing equipment is widely used and plays a key role in the mining and construction industries. For the economical and efficient crushing procedure, choosing the most suitable rock crusher machine is vital for your business. Jaw crusher and impact crusher are the two common crushers applied, do you know what is the difference between the jaw crusher and impact crusher? Before placing an order, lets make a comparison of these two crushing machines.

1. Jaw crushers are mainly used as primary crushers, it can crush hard material, such as granite, basalt. 2. Impact crusher is usually used as a medium-fine hardness crusher, such as limestone, concrete, it has good crushing efficiency of some brittle material. It mainly crushes the small material discharge from the jaw crusher. In general, the jaw crushers are placed before the impact crusher.

1. Jaw crusher can crush various materials with compressive strength below 320MPa, particle size between 125mm 750mm. capacity up to 500 TPH. Most jaw crusher manufacturers provide a complete range of primary jaw crusher and secondary crusher 2. Impact crusher suitable for coarse medium crushing the various soft and medium hard ores which particle size no exceed 500mm, compressive strength less than 50MPa. Output up to 450 TPH. The final discharge size can be adjusted to meet different requirements.

1. Jaw crusher crushes the materials by squeeze action, therefore the finished product has more needle flake, its particle size is generally 10-350mm. 2. But impact crusher uses impact action to reduce the material size, its finished products are mostly cubes with less needle-like material, finer output particle, and better quality.

1. Jaw crusher The motor drives the belt and pulley to move the jaw up and down through an eccentric shaft. When the moving jaw rises, the angle between the toggle plate and the moving jaw increases, thus pushing the moving jaw plate closer to the fixed jaw plate. At the same time, the materials are crushed or split to achieve the purpose of crushing. When the moving jaw goes down, the angle between the toggle plate and the moving jaw becomes smaller. The moving jaw plate leaves the fixed jaw plate under the action of the pull rod and spring, and the broken material is discharged from the lower mouth of the crushing chamber. With the continuous rotation of the motor, the motor jaw is used for the periodic motion to crush and discharge materials, realizing continuous production. 2. Impact crusher Driven by the motor, the rotor rotates at a high speed, and the material and the hammer on the rotor impact and break, and then it is thrown on the counterattack device to be broken again. This process is repeated until the material is broken to the required particle size and discharged from the outlet.

1. Due to the limitation of its own crushing effect, although the size of the ore material crushed by the jaw crusher is uniform, the overall particle size is relatively large, so for users with higher product quality, when purchasing this equipment, Need to consider adding some additional secondary crushers. 2. The impact crusher has a large crushing force, and it also has the effect of stone shaping. Therefore, the ore materials processed by it are mostly cubes, and the gradation is reasonable, which can fully meet the current strict crushing stone production requirements. In brief, in the most crushing plant, these two crushers are often used in close combination.

Which is better, jaw crusher or impact crusher? According to the market sales situation, the overall sales of jaw crushers are more than impact crusher, mainly due to its versatility and flexibility. It can not only be used as a crushing equipment alone, but also can combine with other machines in various production lines. It is a cost-effective one among all crushing equipment. The price of a jaw crusher generally ranges from tens of thousands to hundreds of thousands (Chinese RMB). The specific price can be consulted by the manufacturer.

1. Jaw crusher Deep crushing cavity, which improves the feeding capacity and output; large crushing ratio, uniform product size; reliable and convenient gasket-type discharge opening adjustment device, big adjustment range, increasing the flexibility of the equipment; simple structure, reliable work, less operating costs, energy saving. A single machine can save energy by 15% ~ 30%, the system can save energy more than double; the adjustment range of the discharge port can meet the requirements of different users; low noise and less dust. 2. Impact crusher The clearance between the impact plate and the hammer can be easily adjusted, effectively controlling the discharge particle size, and the shape of the discharge particles is good; the structure is compact, the machine is rigid, and the rotor has a large moment of inertia; the high chrome plate hammer has high impact resistance, wear-resistance and large impact Convenient maintenance, economical and reliable; full crushing function, high productivity, low wear of machine parts, high comprehensive benefits.

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Oct 18, 2019 Materials are evenly transferred to a trommel screen by vibrating feeder, sieved sand have coarse size, fine size, and waste. The qualified fine materials are conveyed into an air classifier for gold concentrating, and the gold-containing fine material is left inside the air classifier, and the gold-free waste is discharged.

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